nandrolone is a DDA. DHT is your androgen sex hormone. so running a DDA will swamp DHT in the body. DHT is what gives guys penises and makes us men.
does testosterone convert to DHT in the body? yes.. but only 5% rate. so yes people who say using more test than deca are somewhat right.. but its a pathetic amount.
what you really want to use with deca is a DHT derivative steroid.. such as proviron.
its amazing how many people run nandrolone and have no idea it is a DDA and then wonder what went wrong and think just upping their test dose would have saved them. WRONG! guys in the old days would NOT stack test with deca, they would stack proviron.. and its amazing how they were smarter than many today even though they had no clue why that was. so if you want my honest opinion, you should stack a DHT with deca. the whole reason for them running deca in the FIRST PLACE was because it aromatized half as much as testosterone, so they didn't have to worry as much about gyno.. back then AI's didn't exist .. so what would of been the point of running more test than deca if they would of gotten the aromatization anyway? exactly they wouldn't!